1) In a large skillet, heat 2 tablespoon of the olive oil. Add the tofu and cook on medium-high heat until both sides are golden. Lower the heat to medium, and carefully pour half of the soy sauce and 1 tablespoon of olive oil over the tofu and stir to coat. Add in half of the sesame seeds and stir to coat. Cook for a few minutes, until the soy sauce is thickened and covers the tofu.
2) Put the tofu on a separate plate and add vegetables and remaining olive oil to the skillet. Cook over medium-high heat until celery is slightly tender. Add in remaining soy sauce and sesame seeds and cook until thickened. Add the tofu back in and heat though. Add in crushed red pepper or other spices if you like. Serve and enjoy!
Source of recipe: I created this recipe when I had some tasty sesame seeds left over from (Vegetarian) Sushi night! You can have it as a side dish, or an entree.